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"1853 Close-up view, showing excavation operations on the Nevada abutment of Hoover Dam. January 14th, 1933.
1901 High scaling activities, in connection with the excavation on the Nevada abutment to Hoover Dam. January 27th, 1933.
1861 Looking upstream in Black Canyon, from the Nevada side. Excavation operations for Downstream Cofferdam shown in foreground. January 18th, 1933."

"1853 Close-up view, showing excavation operations on the Nevada abutment of Hoover Dam. January 14th, 1933.
1901 High scaling activities, in connection with the excavation on the Nevada abutment to Hoover Dam. January 27th, 1933.
1861 Looking upstream in Black Canyon, from the Nevada side. Excavation operations for Downstream Cofferdam shown in foreground. January 18th, 1933."

"1853 Close-up view, showing excavation operations on the Nevada abutment of Hoover Dam. January 14th, 1933.
1901 High scaling activities, in connection with the excavation on the Nevada abutment to Hoover Dam. January 27th, 1933.
1861 Looking upstream in Black Canyon, from the Nevada side. Excavation operations for Downstream Cofferdam shown in foreground. January 18th, 1933."